﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace System.Windows.Forms;

public partial class Control
{
    [Flags]
    private protected enum ExtendedStates
    {
        /// <summary>
        ///  When we change RightToLeft, we need to change the scrollbar thumb. We can't do that until after the
        ///  control has been created, and all the items added back. This is because the system control won't know
        ///  the nMin and nMax of the scroll bar until the items are added. So in RightToLeftChanged, we set a
        ///  flag that indicates that we want to set the scroll position. In OnHandleCreated we check this flag,
        ///  and if set, we BeginInvoke. We have to BeginInvoke since we have to wait until the items are added.
        ///  We only want to do this when RightToLeft changes thus the flags HAVEINVOKED and SETSCROLLPOS.
        ///  Otherwise we would do this on each HandleCreated.
        /// </summary>
        HaveInvoked = 0x00000001,

        SetScrollPosition = 0x00000002,

        /// <summary>
        ///  If set, the control will listen to SystemEvents.UserPreferenceChanged when TopLevel is true and handle is created.
        /// </summary>
        InterestedInUserPreferenceChanged = 0x00000008,

        /// <summary>
        ///  If set, the control DOES NOT necessarily take capture on MouseDown
        /// </summary>
        MaintainsOwnCaptureMode = 0x00000010,

        /// <summary>
        ///  Set to true by ContainerControl when this control is becoming its active control
        /// </summary>
        BecomingActiveControl = 0x00000020,

        /// <summary>
        ///  If set, the next time PerformLayout is called, cachedLayoutEventArg will be cleared.
        /// </summary>
        ClearLayoutArgs = 0x00000040,

        /// <summary>
        ///  Used to flag that <see cref="IsInputKey(Keys)"/> returned true in <see cref="PreProcessMessage(ref Message)" />
        ///  so that <see cref="PreProcessControlMessageInternal(Control, ref Message)"/> doesn't call it again.
        /// </summary>
        InputKey = 0x00000080,

        /// <summary>
        ///  Used to flag that <see cref="IsInputChar(char)"/> returned true in <see cref="PreProcessMessage(ref Message)" />
        ///  so that <see cref="PreProcessControlMessageInternal(Control, ref Message)"/> doesn't call it again.
        /// </summary>
        InputChar = 0x00000100,

        /// <summary>
        ///  Used by <see cref="PreProcessControlMessageInternal(Control, ref Message)"/> to avoid calling
        ///  <see cref="ProcessUICues(ref Message)"/> multiple times.
        /// </summary>
        UiCues = 0x00000200,

        IsActiveX = 0x00000400,

        UserPreferredSizeCache = 0x00000800,

        TopMDIWindowClosing = 0x00001000,

        /// <summary>
        ///  If set, the control is being scaled currently
        /// </summary>
        CurrentlyBeingScaled = 0x00002000
    }
}
